Are the solar-neutrino experiments suggestive of the existence of a resonance in the 3He + 3He system?

Fetisov, V.N.; Kopysov, Yu. S.

doi:10.1016/0370-2693(72)90605-3

Cited by 59 publications

(27 citation statements)

References 6 publications

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“…An interesting side remark is that a hypothetical possibility for reducing 3 He abundance via the resonant enhancement of 3 He( 3 He, α)pp reaction has been actively explored thirty years ago as a possible solution to the solar neutrino "under production" problem [26]. No additional resonances in 6 Be and consequently no additional depletion of 3 He were found [27], and this conclusion can be directly carried over to the BBN calculation.…”

Section: Nuclear Resonances Affecting Lithium Abundancementioning

confidence: 91%

Resonant Enhancement of Nuclear Reactions as a Possible Solution to the Cosmological Lithium Problem

Cyburt

Pospelov

2012

Int. J. Mod. Phys. E

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There is a significant discrepancy between the current theoretical prediction of the cosmological lithium abundance, mostly produced as 7 Be during the Big Bang, and its observationally inferred value. We investigate whether the resonant enhancement of 7 Be burning reactions may alleviate this discrepancy. We identify one narrow nuclear level in 9 B, E 5/2 + ≃ 16.7 MeV that is not sufficiently studied experimentally, and being just ∼ 200 keV above the 7 Be+d threshold, may lead to the resonant enhancement of 7 Be(d, γ) 9 B and 7 Be(d, p)αα reactions. We determine the relationship between the domain of resonant energies E r and the deuterium separation width Γ d that results in the significant depletion of the cosmological lithium abundance and find that (E r , Γ d ) ≃ (170 − 220, 10 − 40) keV can eliminate current discrepancy. Such a large width at this resonant energy can be only achieved if the interaction radius for the deuterium entrance channel is very large, a 27 > ∼ 9 fm. Our results also imply that before dedicated nuclear experimental and theoretical work is done to clarify the role played by this resonance, the current conservative BBN prediction of lithium abundance should carry significantly larger error bars, [ 7 Li/H] BBN = (2.5 − 6) × 10

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Section: Nuclear Resonances Affecting Lithium Abundancementioning

confidence: 91%

Resonant Enhancement of Nuclear Reactions as a Possible Solution to the Cosmological Lithium Problem

Cyburt

Pospelov

2012

Int. J. Mod. Phys. E

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“…The cross section was measured in an energy range from 16.5 to 24.4 keV, totally covering the Gamow peak for the Sun [15,16]. The debated resonance [17,18] was not observed, ruling out the possible nuclear explanation of the so called Solar Neutrino Problem.…”

Section: Solar Hydrogen Burningmentioning

confidence: 99%

“…The ratio between the reaction rates of 17 O(p,α) 14 N (Q = 1.2 MeV) and 17 O(p,γ) 18 F (Q = 5.6 MeV) channels is one of the most important parameters for the galactic synthesis of 17 O, the stellar production of radioactive 18 F, and for predicted O isotopic ratios in premolar grains [37,38].…”

Section: The Other Cno Cyclesmentioning

confidence: 99%

Nuclear Astrophysics in underground laboratories: the LUNA experiment

Simpson¹,

Simenel²,

Cook³

et al. 2017

EPJ Web Conf.

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Abstract. One of the main ingredients of nuclear astrophysics is the knowledge of the thermonuclear reactions responsible for powering the stellar engine and for the synthesis of the chemical elements. At astrophysical energies the cross section of nuclear processes is extremely reduced by the effect of the Coulomb barrier. The low value of cross sections prevents their measurement at stellar energies on Earth surface and often extrapolations are needed. The Laboratory for Underground Nuclear Astrophysics (LUNA) is placed under the Gran Sasso mountain and thanks to the cosmic-ray background reduction provided by its position can investigate cross sections at energies close to the Gamow peak in stellar scenarios. Many crucial reactions involved in hydrogen burning has been measured directly at astrophysical energies with both the LUNA-50kV and the LUNA-400kV accelerators, and this intense work will continue with the installation of a MV machine able to explore helium and carbon burnings. Based on this progress, currently there are efforts in several countries to construct new underground accelerators. In this talk, the typical techniques adopted in underground nuclear astrophysics will be described and the most relevant results achieved by LUNA will be reviewed. The exciting science that can be probed with the new facilities will be highlighted.

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“…A resonance in this region has been suggested [Fowler 1972] [Fetysov and Kopysov 1972] to explain the observed high energy solar neutrino flux, a factor between 2 and 3 lower than the expected one. The enhancement in the 3He(3He, 2p)4He cross section would decrease the relative contribution of the alternative reaction 3He(or, 7)TBe, which generates the branch responsible for high energy neutrino production in the Sun.…”

Section: Introductionmentioning

confidence: 99%

The LUNA project: Status and first results

Arpesella

Barnes

Bartolucci

et al. 1995

AIP Conference Proceedings

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Subthreshold resonance effect in the 6Li(d,α)4He reaction AIP Conf. Proc. 327, 271 (1995) The LUNA Project: Status and First Results C. Arpesella(1), C.A. Barnes(2), F. Bartolucci(1), E. BeUotti(3), C. Broggini(4), P. Corvisiero(5), G. Fiorentini(6), A. Fubini(7), G. Gervino(8), F. Gorris(9), V. Greife(9), C. Gustavino(1), M. Junker(9), R.W.Kavanagh (2), A. Lanza(5), G. Mezzorani(10), P. Prati (5) Fisica and INFN, Cagliari, (11) Politecnico, Torino and INFN, Cagliari, (15) Georgetown University, WashingtonAbstract. LUNA is a pilot project initially focused on the 3He(3He, 2p)4He cross section measurement within the thermal energy region of the Sun (15-27 KeV). A compact high current 50 KV ion accelerator facility including a windowless gas target system, a beam calorimeter and four detector telescopes has been built, tested and installed underground at the Laboratori Nazionaii del Gran Sasso. The sensitivity has been improved by more than four orders of magnitude, as compared to the previous experiment. In particular, thanks to the cosmic ray suppression, we could attain a background level of less than 1 event per week, a rate similar to the one expected from 3He(3He, 2p)4He at the lower edge of the Sun thermal energy region.

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Are the solar-neutrino experiments suggestive of the existence of a resonance in the 3He + 3He system?

Cited by 59 publications

References 6 publications

Resonant Enhancement of Nuclear Reactions as a Possible Solution to the Cosmological Lithium Problem

Resonant Enhancement of Nuclear Reactions as a Possible Solution to the Cosmological Lithium Problem

Nuclear Astrophysics in underground laboratories: the LUNA experiment

The LUNA project: Status and first results

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